diff --git a/pyproject.toml b/pyproject.toml
index 699c320..7393a90 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -7,6 +7,9 @@ requires-python = ">=3.9"
 [tool.pytest.ini_options]
 asyncio_mode = "auto"
 testpaths = ["tests"]
+markers = [
+    "integration: real agent tests (requires RUN_INTEGRATION=1)",
+]
 
 [tool.pyright]
 venvPath = "."